To subscribe to events for an object, the object must be linked to an event registry.
Note: Child objects will inherit the linked event registries of their parent objects.
For example, if an event registry has both IPv4 blocks and IPv4 networks selected
for Object type, and the event registry is linked to the IPv4 block, events
will be generated for both the block and network. To receive events for
only the network, link the registry directly to the child network and not
the parent block.
To link an object to an event registry: